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com3: vs \\.\com3:

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HyperEngineer

Programmer
May 8, 2002
190
US
If I use "com3:" for the filename in CreateFile() I get a legitimate handle. If I use "\\.\com3" for the filename in CreateFile() I get an invalid handle value. I'm using VC2008 Standard edition. I thought I could use either one of these filenames.

HyperEngineer
If it ain't broke, it probably needs improvement.
 
Try to get error code after failed attempt to open COM3 via UNC name. May be the reason is in usufficient rights to access network shares (UNC is a name of network objects).
 
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